Anti-siphon device for flush tank valves



Nov. 1, 1.955 R. J. WENTZ 7 2,722,229

ANTI-SIPHON DEVICE FOR FLUSH TANK VALVES Filed May 29, 1953 2Sheets-Sheet 1 FIG. I

INVENT( )R I L ROBERT J. WENTZ A771 )ANEY Nov. 1, 1.955 R. .1. WENTZANTI-SIPHON DEVICE FOR FLUSH TANK VALVES 2 Sheets-Sheet 2 Filed. May 29,1955 FIG. 4

FIG. 3

FIG. 6

FIG. 5

FIG.

INVENTOR ROBERT J. WENTZ ATTORNEY United States Patent O ANTI-SIPHONDEVICE EUR? FLUSH TANK VALVES Robert J. Wentz, Milford Center, .Ohio,assignor, by mesne assignments, to The Murray Corporation of America,Detroit, Mich, a corporation-of Delaware Application May 29, 1953,Serial No. 358,229

Claims. (Cl. "1*37'216) 'This invention relates to a simple and novelarrangement of anti-siphon device 'for water closet flush tank valvesand, preferably to flush valves ,of the float operated ball cock type,but itis also applicable to other devices requiring a back flow,preventer.

Most plumbing regulationsrequire a closet bowl-flushing apparatus thatwill not permit the contamination of the water supply system by a backsiphoning into said system of water from thecloset bowl ,or the flushtank.

"'This'has given rise to the development of various types of anti-siphondevices associated with flushing valves'for water closet flush tanksand. the present invention has been designed for use'inconnection-preferably with the ball cock type of flush valve,'althoughobviously it can be used with anypre'ferred typevof water closet flushvalve either as an integralpart of the valve body structure or as anadapter or replacement where the type of valve or valve body will permitsuch a conversion.

Specifically thepreferre'd form of the invention relates to ananti-siphon device or unit for ball cock valves for water closet flushtanks and more particularly to what might be called an anti-siphonattachment.or-adapter to'be used in connection with most .of theconventional types of ball cock valves now in use where thereisprovideda fitting in communication with the discharge outlet of the valve body,said fitting comprising .a water discharge outletrfor filling thefiushtankand a watersupply passage adapted to receive a refill tubeforthecloset bowl.

In some instances all of these parts are more or less integral formedwithfltheball'cock valve body and it is to be understood that,applicants invention is also applicable to this type of apparatus, butapplicants preferred form is particularly directed to thefirstmentioned-type wherethe refillfor the tank and refill for the bowl arecontained within a separate-fittingremovably secured to the ballcockvalve body.

The principal object of the presentinvention isthe production of asimple yet practical and eflicient device including in a single unit awater discharge outlet for the filling of the closet tank, a watersupply passage for connecting with the refill tube for the closet bowland an anti-siphon means interposed therebetween, said unit adapted tobe connected, as such, to the water discharge outlet of the ball cockvalve body, either as an original installation or as an adapter orsubstitute for an original fitting not provided with an anti-siphonarrangement.

Another object of the invention is to produce an antisiphon device, forthe purpose indicated, at little additional expense over theconventional type of fitting having no anti-siphoning feature and onethat can be carried by the trade as a replacement or adapter, theconversion being made with little or no trouble and at little additionalexpense.

A further object is the production of a fitting of the type indicatedthat would require in use and function no change whatsoever in the flushvalve structure per se, so long as 2,722,229 Patented Nov. 1, 19 5or'water-pressure control valve associated with the ball cock valve bodyillustrated in Figure 1.

Figure '3 is a view in side'elevation of the adapter unit per seprovided with applicants anti-siphon means.

Figure 4 is an end elevational view of the adapter unit illustrated inFigure 3, and

Figure 5 is a top plan view thereof.

Figure 6 is a vertical sectional view on line 6-6 of Figure 3, and

Figure 7 is a horizontal sectional view on line 77 of Figure 3, bothmore clearly showing the improved anti-siphon feature of applicantsadapter unit.

Referring to the drawings in detail, 1 indicates the conventional watersupply pipe mounted inthe bottom -2 of a water closet flush tank withthe usual gasket and clamping nuts as clearly shown in Figure 1.

The upper end of the water supply pipe 1 carries a valve body 3 providedwith a reciprocating valve 4 controlled by a float (not shown), carriedby the rod 5. This valve body also includes a 'manuallyset or controlledvalve 6 for regulating the volume and pressure of the water passingtherethrough, said water, when the valve 4 is open, passing up the watersupply pipe 1 into the passage 7, past valve 6 (Figure 2) intopassage 8,past the ball cock or float control valve '4 and out through the port 9,to refill the flush tank.

In many installations the port '9 is connected'to a tank refill tube orpipe, extending downwardly to apoint adjacent the bottom 2 of the tankand in other forms this outlet port '9 is connected to various'types offittings for refilling said flush tank from a point above the waterlevel inithe tank and the present invention relates more particularly tothis latter type of fitting.

Referring again to Figure 1, applicants improved fitting consists of aunit 10 provided with an inlet channel 11,

the outer end of which being in communication withothe .outlet port 9 ofthe'ball cock valve 4 and its housing 3.

The inner end of this inlet channel 11 is in communication with achamberlZ which chamber in turn is in com- -munication with a wateroutlet plug 13 for refilling the 0 fiush'tank and apassageway 14connected atits outer end to a refill tube 15 forthe closet bowl. Thisoutlet plug 13 is provided with water restricting means *forproducing-'a coherent stream to -=thereby-silence the 'clischarge of watertherethrough into the flush tank in a well known manner.

To more clearly set forth applicants invention and the improved featuresof the herein set forth arrangement, attention is directed to Figures 3to 7, inclusive, with particular reference to Figures 6 and 7 wherein itwill be noted that the inner end of the passageway 14 is provided end 13extending into or to a point adjacent the tapered bore 16 of saidpassageway 14.

The outer end of this tubular bushing 17 is provided with screw threads19 for securing the same in the wall of the fitting or unit as moreclearly shown in Figures 6 and 7.

With the construction and arrangement as shown, the tubular bushing 17not only provides the necessary restriction to the water passing fromthe chamber 12 around the reduced end of said bushing into thepassageway 14 and refill tube 15, but also provides a novel and simplemeans through its bore 20, for venting to the atmosphere the refill tube15 so that there will be prevented a siphoning of any water from thecloset bowl back into the water supply system. Furthermore, this tubularbushing 17 will provide means for carrying off any back-pressure waternot able to pass through the passageway 14 into the refill tube 15, saidwater passing out of said bushing and down over a water deflector or lip21. The flooding of bore 20 brought about by the restriction between theend of tubular bushing 17 and the chamber 16, produces quiet operationof the unit and eliminates asperation noise.

In addition, it will be noted that there are no moving parts in theherein described vacuum breaker or antisiphon device and the tubularbushing 17 can be easily removed for cleaning in the event of sedimentclogging the opening or said bushing can be replaced if excessivecorrosion occurs without the necessity of shutting oif the water supply.Further, if any part is removed or left out or wrongly assembled, therewill be a noticeable spilling of water to indicate that repairs oradjustment should be made.

The fitting as illustrated in Figures 3 to 7, inclusive, may be used inan original installation in combination with the ball cock valve asshown in Figure 1 or as a replacement or adapter substituting for anoriginal fitting not provided with an anti-siphon means or arrangement.

What I claim is:

1. An anti-siphon adapter for flush valves for water closet fiush tanks,comprising a combination fitting including a water inlet channel, awater discharge outlet, and a water supply passage adapted to beconnected to a refill tube, all in communication with each other, andmeans for restricting the flow of water through said water inlet channelto said refill tube, said restricting means also comprising an air ventfor said combination fitting.

2. An anti-siphon adapter for flush valves for water closet flush tanks,comprising a combination fitting including a water inlet channel, awater discharge outlet and a water supply passage adapted to beconnected to a refill tube, all in communication with each other, andtubular means for restricting the flow of water around said tubularmeans and through said water inlet channel to said refill tube, saidrestricting means also comprising an air vent for said combinationfitting, and also means for the discharge of back pressure water notable to pass through said refill tube.

3. An anti-siphon adapter for ball cock valves for water closet flushtanks, comprising a combination fitting including a water inlet channeladapted to communicate with the discharge outlet of said ball cockvalve, a water discharge outlet and a water supply passage adapted toreceive a refill tube at its outlet end, both in communication with saidwater inlet channel, a removable tubular bushing having its inner endconcentrically positioned within the inlet end of said water supplypassage with slight clearance for restricting the flow of water throughsaid passage, the outer end of said bushing extending through a wall ofsaid combination fitting and secured therein, providing a vent to theatmosphere and also means for the discharge of back pressure Water notable to pass through said inlet tube.

4. An anti-siphon adapter for ball cock valves for water closet flushtanks, comprising a combination fitting including a water inlet channeladapted to communicate with the discharge outlet of said ball cockvalve, a restricted water discharge outlet and a water supply passageadapted to receive at its outlet end a refill tube, both incommunication with said water inlet channel, a removable tubular bushingextending through a wall of said fitting and threaded therein and havingits inner end concentrically positioned within the inlet end of saidwater supply passage with slight clearance, for restricting the flow ofwater through said passage, said tubular bushing providing an air ventfor said fitting and also means for the discharge of back pressure waternot able to pass through said refill tube.

5. An anti-siphon adapter for ball cock valves for water closet flushtanks, comprising a combination fitting including a water inlet channeladapted to communicate with the discharge outlet of said ball cockvalve, a restricted water discharge outlet and a water supply passagehaving a tapered bore at its inlet end and adapted to receive at itsoutlet end a refill tube, both the discharge outlet and water supplypassage being in communication with said water inlet channel, aremovable open ended tubular bushing extending through a wall of saidfitting and threaded therein and having its inner end concentricallypositioned within the tapered bore of the inlet end of said water supplypassage with slight clearance, for restricting the flow of water throughsaid passage, said tubular bushing providing an air vent for saidfitting and also means for the discharge of back pressure water not ableto pass through said refill tube.

References Cited in the file of this patent UNITED STATES PATENTS1,671,361 Frankenberger May 29, 1928 2,087,503 Clemmons July 20, 19372,105,044 Kocour Jan. 11, 1938 2,173,070 Brown Sept. 12, 1939 2,214,863Schultheiss Sept. 17, 1940 2,536,921 Duke Jan. 2, 1951

